Harmless treatment process for waste chromium-containing leather recycle production

Abstract

The invention belongs to the field of reuse of chromium-containing waste leather silk, and in particular relates to a harmless treatment process for resource recycling production of chromium-containing waste leather silk. First, crush the waste leather silk containing chromium and add it to the heating kettle. At the same time, add calcium hydroxide aqueous solution, quickly raise the temperature to 80°C, and then slowly raise the temperature to 135°C; then add calcium chloride to the heating kettle, wait After the complexation concentration in the heating tank reaches 5% to 35%, liquid-solid separation is carried out; after solid-liquid separation, the pH value of the liquid is adjusted to between 6 and 7, and then the liquid is concentrated to between 55% and 65%, and cooled , to obtain industrial environmental protection jelly glue. The present invention provides a harmless treatment process for resource recycling and production of chromium-containing waste leather silk, and effectively utilizes chromium-containing waste leather silk as a resource, so that the available resources of chromium-containing waste leather silk can generate a certain economic value , At the same time, no secondary pollution occurs during the entire treatment process, which solves the existing problems in the treatment of existing chromium-containing leather silk, and thus, the present invention is suitable for large-scale popularization and use.

Description

technical field [0001] The invention belongs to the field of reuse of chromium-containing waste leather silk, and in particular relates to a harmless treatment process for resource recycling production of chromium-containing waste leather silk. Background technique [0002] Chromium-containing waste leather silk is the waste chromium material peeled off from chrome-tanned wet leather during the process of tanning, splitting, and trimming. According to statistics, my country's tanning industry can produce about 1.4 million tons of chromium-containing Chromium scrap. More than 90% of this waste is collagen and contains 2-4% Cr 2 o 3 . Among them, collagen is an important protein resource, and chromium is also a kind of valuable heavy metal resource. At the same time, chromium is toxic, and the toxicity of chromium is mainly reflected by hexavalent chromium, and chromium pollution will cause teratogenic, mutagenic and carcinogenic. Therefore, the generation of chromium-cont...

AI Technical Summary

Problems solved by technology

[0004] Although the above method comprehensively utilizes chromium-containing leather waste, it uses the method of burning the collagen with the highest content in the chromium-containing waste leather to process it. Although heat is generated, the chromium-containing waste leather is burned. During the process, a large amount of organic toxic gases such as sulfur dioxide, benzene, and formaldehyde will be produced. If it is not treated, it will cause secondary pollution to the environment. If it is treated, the value of its combustion will be far lower than the cost of treatment. Therefore, , how to comprehensively treat waste chromium-containing leather silk with high value is the key issue of current research